31861136428 has 24 divisors (see below), whose sum is σ = 61452884304. Its totient is φ = 14333030400.

The previous prime is 31861136407. The next prime is 31861136441. The reversal of 31861136428 is 82463116813.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3728293 + ... + 3736828.

It is an arithmetic number, because the mean of its divisors is an integer number (2560536846).

Almost surely, 2^31861136428 is an apocalyptic number.

It is an amenable number.

31861136428 is a deficient number, since it is larger than the sum of its proper divisors (29591747876).

31861136428 is a wasteful number, since it uses less digits than its factorization.

31861136428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7465233 (or 7465231 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The spelling of 31861136428 in words is "thirty-one billion, eight hundred sixty-one million, one hundred thirty-six thousand, four hundred twenty-eight".